$ j在jQuery中意味着什么？

Question

我最近遇到了一段代码.它如下:

      var myFeature = {

'config' : { 
    'container' : $('#myFeature')
},

'init' : function(config) { 

    if (config && typeof(config) == 'object') {
        $.extend(myFeature.config, config);
    }

    myFeature.$container = myFeature.config.container;

    myFeature.$sections = myFeature.$container.
        find('ul.sections > li'); 

    myFeature.$section_nav = $('<ul/>').
        attr('id','section_nav').
        prependTo(myFeature.$container);

    myFeature.$item_nav = $('<ul/>').
        attr('id','item_nav').
        insertAfter(myFeature.$section_nav);

    myFeature.$content = $('<div/>').
        attr('id','content').
        insertAfter(myFeature.$item_nav);

    myFeature.buildSectionNav(myFeature.$sections);
    myFeature.$section_nav.find('li:first').click();

    myFeature.$container.find('ul.sections').hide();

    myFeature.initialized = true;

},


'buildSectionNav' : function($sections) {

    $sections.each(function() {

        var $section = $(this);

        $('<li/>').
            text($section.find('h2:first').text()).
            appendTo(myFeature.$section_nav).
            data('section', $section).
            click(myFeature.showSection);
    });

},

'buildItemNav' : function($items) {

    $items.each(function() {
        var $item = $(this);

        $('<li/>').
            text($item.find('h3:first').text()).
            appendTo(myFeature.$item_nav).
            data('item', $item).
            click(myFeature.showContentItem);

    });

},

'showSection' : function() { 

    var $li = $(this);

    myFeature.$item_nav.empty();
    myFeature.$content.empty();

    var $section = $li.data('section');

    $li.addClass('current').
        siblings().removeClass('current');

    var $items = $section.find('ul li');

    myFeature.buildItemNav($items);

    myFeature.$item_nav.find('li:first').click();

},

'showContentItem' : function() {

    var $li = $(this);

    $li.addClass('current').
        siblings().removeClass('current');

    var $item = $li.data('item');

    myFeature.$content.html($item.html());

}

 };

我知道$('#myFeature'),$(this)的意思.但是$ li和myFeature.$ container是什么意思？它们是某种变量吗？如果是这样,myFeature的范围是什么.$ container？因为它没有使用var声明,它是全局的吗？

Answer 1

$li并且$container只是变量名,这样命名,所以程序员知道它们是jQuery扩展对象.